The P-A-1 Filter Adaptor and Seal Kit allows you to transform your PD-101 into a PD-100.
This kit includes two (2) light grey P-A-1 cartridge adaptors and seals made from heavy-duty plastic. They are compatible with Parcil Safety full face and half face respirators and are designed to pair with the P-A-1 filters.
For help, check out Changing a PD-101 into a PD-100 Mask.